VulnerabilityPublished 19 Jul 2026Updated 21 Oct 2026

CVE-2026-63963: Linux kernel · usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f9d787fbe83127105e42088cca40e5118db0d810 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f9d787fbe83127105e42088cca40e5118db0d810, ed8649f3822e211d025bcab5158af6f8a38c8705, 569f7971542eb10025d8a0989b83f28a29d8ba20 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f0690a25a140b853b1842fa80faf828601bb47e8, < f9d787fbe83127105e42088cca40e5118db0d810	Fixed in f9d787fbe83127105e42088cca40e5118db0d810
LinuxLinux	Affected ≥ f0690a25a140b853b1842fa80faf828601bb47e8, < ed8649f3822e211d025bcab5158af6f8a38c8705	Fixed in ed8649f3822e211d025bcab5158af6f8a38c8705
LinuxLinux	Affected ≥ f0690a25a140b853b1842fa80faf828601bb47e8, < 569f7971542eb10025d8a0989b83f28a29d8ba20	Fixed in 569f7971542eb10025d8a0989b83f28a29d8ba20
LinuxLinux	Affected ≥ f0690a25a140b853b1842fa80faf828601bb47e8, < 8fbc349e8383125dd2d8de1c1e926279d398ab17	Fixed in 8fbc349e8383125dd2d8de1c1e926279d398ab17
LinuxLinux	Affected ≥ f0690a25a140b853b1842fa80faf828601bb47e8, < 6bacd22e1eae77abf089bbdc016270200a8dc83b	Fixed in 6bacd22e1eae77abf089bbdc016270200a8dc83b
LinuxLinux	Affected =4.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers Properly validate the count passed from a device when calling svdm_consume_identity() or svdm_consume_identity_sop_prime() as the device-controlled value could index off of the static arrays, which could leak data.

References

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